[RFC v2 1/9] serdev: implement parity configuration

[Martin Blumenstingl]

On Tue, Jan 2, 2018 at 10:16 PM, Martin Blumenstingl
<martin.blumenstingl at googlemail.com> wrote:
> Hi Marcel, Hi Rob,
>
> On Tue, Jan 2, 2018 at 12:16 PM, Marcel Holtmann <marcel at holtmann.org> wrote:
>> Hi Martin,
>>
>>> Some Bluetooth modules (for example the ones found in Realtek RTL8723BS
>>> and RTL8723DS) want to communicate with the host with even parity
>>> enabled.
>>> Add a new function and the corresponding internal callbacks so parity
>>> can be configured. This supports enabling and disabling parity as well
>>> as setting the type to odd or even.
>>>
>>> Signed-off-by: Martin Blumenstingl <martin.blumenstingl at googlemail.com>
>>> ---
>>> drivers/tty/serdev/core.c           | 12 ++++++++++++
>>> drivers/tty/serdev/serdev-ttyport.c | 21 +++++++++++++++++++++
>>> include/linux/serdev.h              |  5 +++++
>>> 3 files changed, 38 insertions(+)
>>>
>>> diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
>>> index 1bef39828ca7..d327b02980f5 100644
>>> --- a/drivers/tty/serdev/core.c
>>> +++ b/drivers/tty/serdev/core.c
>>> @@ -225,6 +225,18 @@ void serdev_device_set_flow_control(struct serdev_device *serdev, bool enable)
>>> }
>>> EXPORT_SYMBOL_GPL(serdev_device_set_flow_control);
>>>
>>> +void serdev_device_set_parity(struct serdev_device *serdev, bool enable,
>>> +                           bool odd)
>>> +{
>>> +     struct serdev_controller *ctrl = serdev->ctrl;
>>> +
>>> +     if (!ctrl || !ctrl->ops->set_parity)
>>> +             return;
>>> +
>>> +     ctrl->ops->set_parity(ctrl, enable, odd);
>>> +}
>>> +EXPORT_SYMBOL_GPL(serdev_device_set_parity);
>>> +
>>
>> this really needs Rob’s ACK before I take the patch.
> sure
>
> I could even live with a NACK in case these two bool parameters are
> considered to be ugly
> in that case I would propose an enum with three values: DISABLED,
> EVEN, ODD so the arguments would look like this:
> void serdev_device_set_parity(struct serdev_device *serdev, enum parity)
I just discovered: such a patch was already posted by Ulrich Hecht: [0]


[0] https://patchwork.kernel.org/patch/9903787/